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11
. CRANKCASE/CRANKSHAFT
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• This section covers crankcase separation to service the crankshaft. The engine must be removed
for this operation.
• When separating the crankcase, never use a driver to pry the crankcase mating surfaces apart
forcedly to prevent damaging the mating surfaces.
• When installing the crankcase, do not use an iron hammer to tap it.
• The following parts must be removed before separating the crankcase.
Cylinder head ( chapter 6)
Cylinder/piston ( chapter 7)
Right crankcase cover/drive and driven pulley ( chapter 8)
A.C. generator/starter clutch ( chapter 9)
Rear wheel/rear shock absorber ( chapter 15)
Starter motor ( chapter 18)
Oil pump ( chapter 4)
SPECIFICATIONS
Connecting rod big end side clearance
Crankshaft Connecting rod big end radial clearance
Runout
TORQUE VALUES
Crankcase bolt
Cam chain tensioner slipper bolt
TROUBLESHOOTING
Excessive engine noise
• Excessive bearing play
• Excessive crankpin bearing play
• Worn piston pin and piston pin hole
www.PlanDeGraissage.org
Item
7.8_
10.8N-m
7.8_
11.8N-m
YUP 250
Standard (mm)
Service Limit (mm)
0.15_
0.35
0._
0.008
æ
0.6
0.05
0.10
11-2
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